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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by karvek[/i] [br]Hi all, I am new here :) I am struggling with Origin lately and I thought that writing directly in the official forum might be kind of help. I am trying to perform a simultaneous fit of the same function on different datasets but I am not completely satisfied by the result. I try to summary my problem in the following: I am using Origin C. My function is something like f(x,y,z,A,B,C,...) so it depends on 3 independent variables (x,y and z) and a list of parameters that I would like to fit (A,B,C etc). My datasets are always of the type f(x,k1,k2,A,B,C,..) or f(k1,y,k2,A,B,C,..) so there is always 1 free variable and the others 2 are fixed. My datasets don't have the same number of elements so if I try to fit them simultaneously then Origin stops at the lowest dimension array. I tried to sneak out of this issue by cyclically 'copying' the shortest dataset on the worksheet so that at least I have the same size for the datasets. I can indeed fit my functions if I do this but the results of the fit are not really satisfying and I was wondering if there is a clever way to do this kind of fit. Global fitting I understand is not really a solution for me because it is useful only for functions of 1 variable that share parameters over datasets and that is not my case unfortunately. Thanks anyone for the help. I am using OriginPro 9.1.0 Sr2 on Windows 7. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.